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*DECK SYB4TH
SUBROUTINE SYB4TH (NRMAX,RAYONS,PENTES,ORIGIN,ISCMIN,ISCMAX,
& ANGLES,DXMIN,DELTAC,ISCW,ISCE,ISXW,ISXE,NHMAX,IXRAYO,HXRAYO)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Compute the intersection lenghts of a track in a sectorized Cartesian
* cell.
*
*Copyright:
* Copyright (C) 2002 Ecole Polytechnique de Montreal
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version
*
*Author(s): A. Hebert
*
*Parameters: input
* NRMAX number of radius.
* RAYONS radius of each tube.
* PENTES slope of the track with respect to the axis or to the sides.
* ORIGIN origin of the track.
* ISCMIN first sector with a possible intersection.
* ISCMAX last sector with a possible intersection.
* ANGLES slope of the sectors.
* DXMIN accuracy.
* DELTAC position of the track.
*
*Parameters: output
* ISCW index of the first sector (west/left).
* ISCE index of the last sector (east/right).
* ISXW index of the first side (west/left). Equal to 1 or 2.
* ISXE index of the last side (east/right). Equal to 3 or 4.
* NHMAX number of intersections.
* IXRAYO indices of the intersecting tubes.
* HXRAYO position of the intersections (boundary).
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER NRMAX,ISCMIN,ISCMAX,ISCW,ISCE,ISXW,ISXE,NHMAX,
& IXRAYO(NHMAX)
REAL RAYONS(NRMAX),PENTES(4),ORIGIN(4),ANGLES(ISCMAX),DXMIN,
& DELTAC,HXRAYO(NHMAX+1)
*----
* LOCAL VARIABLES
*----
CHARACTER * 4 AJOU(2)
LOGICAL AJRAYO
LOGICAL AJSECT
*
* Remarque Importante :
* Pour choisir entre deux lignes Proches
* Il faut prendre le cas correspondant a
* DELTAC + DXMIN
* ZHC + DXMIN
*
DXMAX = 2.
D2 = DELTAC * DELTAC
DR = DELTAC + DXMIN
ZH1 = DR * PENTES(1) + ORIGIN(1)
ZH2 = DR * PENTES(2) + ORIGIN(2)
IF (ZH2 .GE. (ZH1 - DXMIN)) THEN
ZHW = DELTAC * PENTES(2) + ORIGIN(2)
ISXW = 2
ELSE
ZHW = DELTAC * PENTES(1) + ORIGIN(1)
ISXW = 1
ENDIF
ZH3 = DELTAC * PENTES(3) + ORIGIN(3)
ZH4 = DELTAC * PENTES(4) + ORIGIN(4)
IF (ZH3 .LE. (ZH4 + DXMIN)) THEN
ZHE = ZH3
ISXE = 3
ELSE
ZHE = ZH4
ISXE = 4
ENDIF
*
* Recherche du Premier Secteur
* L'Angle ISC delimite les Secteurs ISC,ISC+1
DO 101 ISCW = ISCMIN, ISCMAX
ZHS = DELTAC * ANGLES(ISCW)
IF (ZHS .GT. (ZHW + DXMIN)) THEN
GOTO 102
ENDIF
101 CONTINUE
ISCW = ISCMAX + 1
ZHS = ZHE + DXMAX
102 CONTINUE
*
* Couronne Interne
DO 201 NRMIN = 1, NRMAX
IF (RAYONS(NRMIN) .GT. DR) THEN
R2 = RAYONS(NRMIN) * RAYONS(NRMIN)
H2 = R2 - D2
IF (H2 .GT. 0.) THEN
H0 = SQRT(H2)
GOTO 202
ENDIF
ENDIF
201 CONTINUE
H0 = 0.
NRMIN = NRMAX + 1
202 CONTINUE
* NRMIN = Couronne la Plus Interne
* NRMIN = Le Plus Petit Rayon a Prendre en Compte
* DXMIN - H0 = Limite entre Couronnes West et Est
*
* Recherche du Premier Rayon
H2 = ZHW * ZHW
R2 = D2 + H2
RW = SQRT(R2)
*
* Pente pour le Rayon West
* Pente pour le Cote
* PR = - DELTAC / ZHW
* PC = PENTES(ISXW)
*
* -------------
* Debut
* Couronne West
* -------------
*
* Aucune Couronne
IF (NRMIN .GT. NRMAX) THEN
ZHR = ZHE + DXMAX
ICC = NRMIN
*
* Couronne a Gauche (ZHW <0)
ELSEIF (ZHW .LE. (- 0.5 * H0)) THEN
IF ((- ZHW * PENTES(ISXW)) .GT. DR) THEN
RW = RW - DXMIN
ELSE
RW = RW + DXMIN
ENDIF
DO 221 ICC = NRMAX, NRMIN, -1
ZRR = RAYONS(ICC)
IF (ZRR .LE. RW) THEN
GOTO 222
ENDIF
221 CONTINUE
ICC = NRMIN - 1
222 CONTINUE
IF (ICC .LT. NRMIN) THEN
ZHR = H0
ELSE
R2 = ZRR * ZRR
H2 = R2 - D2
ZHR = - SQRT(H2)
ENDIF
ICC = ICC + 1
*
* Couronne Centrale
ELSEIF (ZHW .LE. (0.5 * H0)) THEN
ICC = NRMIN
ZHR = H0
*
* Couronne a Droite (ZHW >0)
ELSE
IF ((ZHW * PENTES(ISXW)) .GT. - DR) THEN
RW = RW + DXMIN
ELSE
RW = RW - DXMIN
ENDIF
DO 231 ICC = NRMIN, NRMAX
ZRR = RAYONS(ICC)
IF (ZRR .GE. RW) THEN
GOTO 232
ENDIF
231 CONTINUE
ICC = NRMAX + 1
232 CONTINUE
IF (ICC .GT. NRMAX) THEN
ZHR = ZHE + DXMAX
ELSE
R2 = ZRR * ZRR
H2 = R2 - D2
ZHR = SQRT(H2)
ENDIF
*
ENDIF
* -------------
* Couronne West
* Fin
* -------------
*
* Premiere Position Courante
IHC = 1
ISC = ISCW
ZHC = ZHW
*
IXRAYO(IHC) = ICC
HXRAYO(IHC) = ZHC
*
* Cote West Intersecte Rayon
IF (ZHR .LE. (ZHC + DXMIN)) THEN
IF (ZHR .GT. 0.) THEN
ICC = ICC + 1
ELSE
ICC = ICC - 1
ENDIF
ZHC = MAX (ZHR, ZHC)
*
IHC = IHC + 1
IXRAYO(IHC) = ICC
HXRAYO(IHC) = ZHC
*
IF (ICC .GT. NRMAX) THEN
ZHR = ZHE + DXMAX
ELSEIF (ICC .EQ. NRMIN) THEN
ZHR = H0
ELSEIF (ZHR .LT. 0.) THEN
R2 = RAYONS(ICC-1) * RAYONS(ICC-1)
H2 = R2 - D2
ZHR = - SQRT(H2)
ELSE
R2 = RAYONS(ICC) * RAYONS(ICC)
H2 = R2 - D2
ZHR = SQRT(H2)
ENDIF
ENDIF
*
* Suivant
555 CONTINUE
ZHN = MIN (ZHE, ZHR, ZHS)
*
* +++
* Debut
* point Courant (<Est)
IF ((ZHN + DXMIN) .LT. ZHE) THEN
*
* Increment Rayon
* Increment Secteur
AJRAYO = (ZHN + DXMIN) .GE. ZHR
AJSECT = (ZHN + DXMIN) .GE. ZHS
*
* soit Intersection Rayon et Secteur
* soit Intersection SEULEMENT Rayon
* soit Intersection SEULEMENT Secteur (non Rayon, non Cote)
*
IF (AJRAYO) THEN
IF (AJSECT) THEN
NBAJ = 2
* Choix pentes
* PR = - DELTAC / ZHN
* PS = ANGLES(ISC)
IF (ZHN .GT. 0.) THEN
ZZ = ZHN * ANGLES(ISC)
IF (ZZ .LT. - DR) THEN
AJOU(1) = 'Sect'
AJOU(2) = 'Rayo'
ELSE
AJOU(1) = 'Rayo'
AJOU(2) = 'Sect'
ENDIF
ELSE
ZZ = - ZHN * ANGLES(ISC)
IF (ZZ .LT. DR) THEN
AJOU(1) = 'Sect'
AJOU(2) = 'Rayo'
ELSE
AJOU(1) = 'Rayo'
AJOU(2) = 'Sect'
ENDIF
ENDIF
* Autre Cas
* =soit Intersection SEULEMENT Rayon (non Secteur)
* =soit Intersection SEULEMENT Secteur (non Rayon, non Cote)
ELSE
NBAJ = 1
AJOU(1) = 'Rayo'
ENDIF
ELSE
NBAJ = 1
AJOU(1) = 'Sect'
ENDIF
*
DO 321 IAJ = 1, NBAJ
*
IHC = IHC + 1
*
* Avance Rayon
IF (AJOU(IAJ) .EQ. 'Rayo') THEN
*
ZZ = MAX (ZHR, ZHC)
HXRAYO(IHC) = ZZ
ZHC = ZZ
*
IF (ZHR .GT. 0.) THEN
ICC = ICC + 1
IF (ICC .GT. NRMAX) THEN
ZHR = ZHE + DXMAX
ELSE
R2 = RAYONS(ICC) * RAYONS(ICC)
H2 = R2 - D2
ZHR = SQRT(H2)
ENDIF
ELSE
ICC = ICC - 1
IF (ICC .EQ. NRMIN) THEN
ZHR = H0
ELSE
R2 = RAYONS(ICC-1) * RAYONS(ICC-1)
H2 = R2 - D2
ZHR = - SQRT(H2)
ENDIF
ENDIF
IXRAYO(IHC) = ICC
*
* Avance Secteur
ELSE
*
ZZ = MAX (ZHS, ZHC)
HXRAYO(IHC) = ZZ
ZHC = ZZ
*
IXRAYO(IHC) = ICC
ISC = ISC + 1
IF (ISC .GT. ISCMAX) THEN
ZHS = ZHE + DXMAX
ELSE
ZHS = DELTAC * ANGLES(ISC)
ENDIF
ENDIF
321 CONTINUE
*
GOTO 555
*
ENDIF
* point Courant (<Est)
* Fin
* +++
*
* Debut
* point Final (Est)
*
* Intersection Couronne
IF ((ZHN + DXMIN) .GE. ZHR) THEN
* ? Pentes
* PR = - DELTAC / ZHR
* PC = PENTES(ISXE)
IF (ZHR .GT. 0.) THEN
ZZ = ZHR * PENTES(ISXE)
AJRAYO = ZZ .GT. - DR
ELSE
ZZ = - ZHR * PENTES(ISXE)
AJRAYO = ZZ .GT. DR
ENDIF
IF (AJRAYO) THEN
IHC = IHC + 1
ZZ = MIN(ZHR, ZHE)
ZZ = MAX(ZZ , ZHC)
HXRAYO(IHC) = ZZ
ZHC = ZZ
IF (ZHR .GT. 0.) THEN
ICC = ICC + 1
ELSE
ICC = ICC - 1
ENDIF
IXRAYO(IHC) = ICC
*
ENDIF
ENDIF
*
HXRAYO(IHC+1) = MAX(ZHC, ZHE)
NHMAX = IHC
ISCE = ISC
*
RETURN
END
|
